Re: [PATCH] power: reset: nvmem-reboot-mode: respect cell size for nvmem_cell_write

[kernel test robot <lkp@intel.com>]

Hi Alexander,

kernel test robot noticed the following build errors:

[auto build test ERROR on sre-power-supply/for-next]
[also build test ERROR on amd-pstate/linux-next amd-pstate/bleeding-edge linus/master v6.19-rc1 next-20251212]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Alexander-Koskovich/power-reset-nvmem-reboot-mode-respect-cell-size-for-nvmem_cell_write/20251214-090110
base:   https://git.kernel.org/pub/scm/linux/kernel/git/sre/linux-power-supply.git for-next
patch link:    https://lore.kernel.org/r/20251214005903.2802724-1-akoskovich%40pm.me
patch subject: [PATCH] power: reset: nvmem-reboot-mode: respect cell size for nvmem_cell_write
config: i386-randconfig-004-20251214 (https://download.01.org/0day-ci/archive/20251215/202512150225.njZvGeNB-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251215/202512150225.njZvGeNB-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202512150225.njZvGeNB-lkp@intel.com/

All errors (new ones prefixed by >>):

>> drivers/power/reset/nvmem-reboot-mode.c:32:2: error: call to undeclared function 'kfree'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
      32 |         kfree(buf);
         |         ^
   1 error generated.


vim +/kfree +32 drivers/power/reset/nvmem-reboot-mode.c

    18	
    19	static int nvmem_reboot_mode_write(struct reboot_mode_driver *reboot,
    20					    unsigned int magic)
    21	{
    22		struct nvmem_reboot_mode *nvmem_rbm;
    23		size_t buf_len;
    24		void *buf;
    25		int ret;
    26	
    27		nvmem_rbm = container_of(reboot, struct nvmem_reboot_mode, reboot);
    28	
    29		buf = nvmem_cell_read(nvmem_rbm->cell, &buf_len);
    30		if (IS_ERR(buf))
    31			return PTR_ERR(buf);
  > 32		kfree(buf);
    33	
    34		if (buf_len > sizeof(magic))
    35			return -EINVAL;
    36	
    37		ret = nvmem_cell_write(nvmem_rbm->cell, &magic, buf_len);
    38		if (ret < 0)
    39			dev_err(reboot->dev, "update reboot mode bits failed\n");
    40	
    41		return ret;
    42	}
    43	

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